USGS IN YOUR STATE

OFFICES

Florida

Davie:

(954) 377-5900

Ft. Myers:

(239) 275-8448

Lutz:

(813) 498-5000

Orlando:

(407) 803-5500

Tallahassee:

(850) 553-3640

Puerto Rico

San Juan:

(787) 749-7400

Florida DroughtWatch

This map (from USGS's National
Drought Watch Web site) shows the 7-day average streamflow
conditions in hydrologic units. Thus, the map shows conditions
adjusted for this time of the year. The colors represent 7-day
average streamflow percentiles for the day of the year. USGS sites
having at least 30 years of record are used. The data used to produce
this map are provisional and have not been reviewed or edited. They
may be subject to significant change.

Map of below normal 7-day average streamflow compared to
historical streamflow for the day of year

This map (from USGS's National Drought Watch Web site) shows the 28-day average streamflow conditions in hydrologic units. Thus, the map shows conditions adjusted for this time of the year. The colors represent 28-day average streamflow percentiles for the day of the year. USGS sites having at least 30 years of record are used. The data used to produce this map are provisional and have not been reviewed or edited.

Explanation of the Percentiles classes

A percentile is a value on a scale of one hundred that indicates the percent of a distribution that is equal to or below it. See more

For example, a class of 20 students had the following scores on their most recent test: 75, 77, 78, 78, 80, 81, 81, 82, 83, 84, 84, 84, 85, 87, 87, 88, 88, 88, 89, 90. The score of 80% has four scores below it. Since 4/20 = 20%, 80 is the 20th percentile of the class. The score of 90 has 19 scores below it. Since 19/20 = 95%, 90 corresponds to the 95 percentile of the class.

In general,

"Low" indicates that the extimated streamflow is a new record low for this day of the year

"<=5" indicates that the extimated streamflow is less than or to the 5th percentile for this day of the year.

"6-9" indicates that the extimated streamflow is between the 6th and 9th percentile for this day of the year.

"10-24" indicates that the extimated streamflow is between the 10th and 24th percentile for this day of the year.